package com.mall;

import com.alibaba.fastjson.serializer.SerializerFeature;
import com.alibaba.fastjson.support.config.FastJsonConfig;
import com.alibaba.fastjson.support.spring.FastJsonHttpMessageConverter;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.boot.autoconfigure.http.HttpMessageConverters;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.ComponentScan;
import org.springframework.http.MediaType;
import org.springframework.http.converter.HttpMessageConverter;
import org.springframework.web.cors.CorsConfiguration;
import org.springframework.web.cors.UrlBasedCorsConfigurationSource;
import org.springframework.web.filter.CorsFilter;

import java.util.ArrayList;
import java.util.List;

@SpringBootApplication
@ComponentScan(basePackages = "com.*")
public class SpringbootApplication {
    public static void main(String[] args) {
        SpringApplication.run(SpringbootApplication.class, args);
    }

    @Bean
    public HttpMessageConverters fastJsonHttpMessageConverters(){
        //1、先定义一个convert转换消息的对象
        FastJsonHttpMessageConverter fastConverter=new FastJsonHttpMessageConverter();
        //2、添加fastjson的配置信息，比如是否要格式化返回的json数据；
        FastJsonConfig fastJsonConfig=new FastJsonConfig();
        fastJsonConfig.setSerializerFeatures(SerializerFeature.PrettyFormat,SerializerFeature.WriteNullStringAsEmpty,SerializerFeature.WriteMapNullValue,SerializerFeature.DisableCircularReferenceDetect);

        //附加：处理中文乱码
        List<MediaType> fastMedisTypes = new ArrayList<MediaType>();
        fastMedisTypes.add(MediaType.APPLICATION_JSON_UTF8);
        fastConverter.setSupportedMediaTypes(fastMedisTypes);

        //3、在convert中添加配置信息
        fastConverter.setFastJsonConfig(fastJsonConfig);
        HttpMessageConverter<?> converter=fastConverter;
        return new HttpMessageConverters(converter);
    }


    private CorsConfiguration buildConfig() {
        CorsConfiguration corsConfiguration = new CorsConfiguration();
        corsConfiguration.addAllowedOrigin("*");
        corsConfiguration.addAllowedHeader("*");
        corsConfiguration.addAllowedMethod("*");
        return corsConfiguration;
    }

    /**
     * 跨域过滤器
     *
     * @return
     */
    @Bean
    public CorsFilter corsFilter() {
        UrlBasedCorsConfigurationSource source = new UrlBasedCorsConfigurationSource();
        source.registerCorsConfiguration("/**", buildConfig()); // 4
        return new CorsFilter(source);
    }



}
